In 1921, a total of just 1,006,473 Peace silver dollars were struck (compared to over 87 million Morgan silver dollars issued earlier in 1921). The number was so low because only the principal Philadelphia Mint struck the new coin, from December 26 to December 31. And the first Peace dollar had experimental high-relief designs that slowed up the minting process. Thus, the 1921 Peace silver dollar had one of the lowest annual mintages in the entire series. And it remains the only American silver dollar ever struck in beautiful high-relief.